Alert archive / Arizona / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 277, NWS Phoenix, AZ

October 15, 2022Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 15, 2022, 7:25 PM MST for Maricopa County, Arizona. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 15, 2022, 7:25 PM MST (02:25 UTC)
Expired: Oct 15, 2022, 8:00 PM MST
In force: 35 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 02:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 2.4 hours before the alert went out and 198 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 354 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1683 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 15, 7:20 PM MST, 5 minutes earlier.

Area forecast discussion, Oct 15, 7:20 PM MST, 5 minutes before

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In the hours before

Local storm report, Oct 15, 6:40 PM MST, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
640 PM MST SAT OCT 15 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0639 PM     FLASH FLOOD      15 SSW BUCKEYE          33.19N 112.71W
10/15/2022                   MARICOPA           AZ   COUNTY OFFICIAL

            RAINBOW WASH ABOVE BANK FULL AT 4.22 FT
            STAGE. EXPECTED TO ARRIVE AT/FLOOD US 80
            CROSSING NEAR THE REPORT TIME.

&&

JM

Special weather statement, Oct 15, 6:44 PM MST, 41 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
644 PM MST Sat Oct 15 2022

AZZ538-540-160230-
Buckeye/Avondale AZ-Tonopah Desert AZ-
644 PM MST Sat Oct 15 2022

...A strong thunderstorm will impact portions of Maricopa County
through 730 PM MST...

At 644 PM MST, Doppler radar was tracking a strong thunderstorm near
Palo Verde Nuclear Generation Station, or 10 miles southwest of
Buckeye, moving northwest at 30 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Buckeye, Tonopah, Palo Verde, Palo Verde Nuclear Generation Station,
Wintersburg, Hassayampa and Arlington.

This includes the following highways...
AZ Interstate 10 between mile markers 92 and 113.
AZ Route 85 between mile markers 147 and 154.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3333 11256 3326 11284 3361 11305 3367 11273
TIME...MOT...LOC 0144Z 153DEG 26KT 3338 11276

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

GL

Local storm report, Oct 15, 6:57 PM MST, 28 minutes before

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Local storm report, Oct 15, 7:02 PM MST, 23 minutes before

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Local storm report, Oct 15, 7:10 PM MST, 15 minutes before

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Special weather statement, Oct 15, 7:17 PM MST, 8 minutes before

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The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 15, 5:01 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Maricopa, Pinal	44 min
Oct 15, 5:13 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	8 hr
Oct 15, 5:15 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	4 hr
Oct 15, 5:18 PM MST	Special Weather Statement	PSR	Maricopa	42 min
Oct 15, 5:21 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	4 hr
Oct 15, 5:26 PM MST	Special Weather Statement	PSR	Maricopa	34 min
Oct 15, 5:31 PM MST	Special Weather Statement	PSR		44 min
Oct 15, 5:41 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	49 min
Oct 15, 6:01 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	29 min
Oct 15, 6:06 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	9 hr
Oct 15, 6:08 PM MST	Special Weather Statement	PSR	Maricopa	37 min
Oct 15, 6:17 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	28 min
Oct 15, 6:32 PM MST	Special Weather Statement	PSR		43 min
Oct 15, 6:34 PM MST	Special Weather Statement	PSR	Maricopa	41 min
Oct 15, 6:39 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Oct 15, 6:44 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Oct 15, 6:44 PM MST	Special Weather Statement	PSR	Maricopa	46 min
Oct 15, 6:49 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	41 min
Oct 15, 6:53 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Oct 15, 7:00 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Oct 15, 7:17 PM MST	Special Weather Statement	PSR	Maricopa	43 min
Oct 15, 8:28 PM MST	Special Weather Statement	PSR	Maricopa	47 min
Oct 15, 8:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Oct 15, 9:01 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa	29 min
Oct 15, 9:42 PM MST	Special Weather Statement	PSR	Maricopa	48 min
Oct 15, 9:57 PM MST	Special Weather Statement	PSR	Maricopa	33 min
Oct 15, 10:00 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Oct 15, 10:56 PM MST	Special Weather Statement	PSR	Pinal	34 min
Oct 15, 11:46 PM MST	Special Weather Statement	PSR	Pinal	29 min
Oct 16, 12:35 AM MST	Special Weather Statement	PSR		40 min
Oct 16, 12:48 AM MST	Areal Flood Warning	PSR	Maricopa	14 hr
Oct 16, 12:51 AM MST	Areal Flood Warning	PSR	Maricopa	5 hr
Oct 16, 12:52 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Oct 16, 1:08 AM MST	Areal Flood Warning	PSR	Maricopa	5 hr
Oct 16, 1:26 AM MST	Special Weather Statement	PSR		49 min
Oct 16, 1:29 AM MST	Special Weather Statement	PSR		46 min
Oct 16, 1:36 AM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	39 min
Oct 16, 1:39 AM MST	Special Weather Statement	PSR		51 min
Oct 16, 2:14 AM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	15 min
Oct 16, 2:28 AM MST	Special Weather Statement	PSR	Maricopa	47 min
Oct 16, 2:52 AM MST	Areal Flood Warning	PSR	Maricopa	3 hr
Oct 16, 4:41 AM MST	Special Weather Statement	PSR	Pinal	49 min
Oct 16, 7:59 AM MST	Special Weather Statement	PSR	Maricopa	46 min
Oct 16, 8:47 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Oct 16, 10:23 AM MST	Special Weather Statement	PSR	Pinal	37 min
Oct 16, 11:03 AM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	3 hr
Oct 16, 11:30 AM MST	Special Weather Statement	PSR	Pinal	45 min
Oct 16, 1:52 PM MST	Special Weather Statement	PSR	Pinal	38 min
Oct 16, 3:10 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	34 min
Oct 15, 5:11 PM MST	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Oct 15, 5:17 PM MST	Special Weather Statement	PSR	Imperial	43 min
Oct 15, 5:46 PM MST	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Oct 15, 7:52 PM MST	Areal Flood Warning	PSR	Imperial	6 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2022 Every severe thunderstorm warning in 2022

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.